Malicious PDF — malware analysis report

Static analysis result for SHA-256 73339d784d095a56…

MALICIOUS

PDF

91.9 KB Created: 2021-09-20 01:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48e6310abf833cbf1c76da42661e55f0 SHA-1: bd6dcdd5a51b4fcd1590021cf1f30bf371394a7b SHA-256: 73339d784d095a56e01b7fd61a4ff9a61893330ec0c049eadb552133f1cf3961
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, and one heuristic identifies it as a link farm. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://handgun.ee/media/file/didonolofezugopisugoji.pdf In PDF document text
    • http://bualuang101.com/backoffice/upload/files/72375687199.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/61897846620.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/visifuwijimawi.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/zifinavijoleza.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/77375264636.pdfIn PDF document text
    • http://coherence.cz/userfiles/file/dakubixulusulizugemuv.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/nuwum.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/58307850379.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/rusozaperovape.pdfIn PDF document text
    • http://itena.si/uporabnik/file/26584446144.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/kogikijuxazalevaxet.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/sewovuxekukibe.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/7466118626.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/bomewatakotu.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/11220333739.pdfIn PDF document text
    • http://myesen.life/userfiles/file/65532868652.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/11728619201.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/zesenodarepegenu.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/ratukurojijugoni.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/5104787705.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d24050de0---91635778650.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/vepupovodunaduweb.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210914_E30C187F050F4E19.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pok%C3%A9mon+go+spoofing+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 10812 bytes
SHA-256: 866b201c87b1f10c4c8f1de310fec705c29f0ab76ac056d7232ddc639547b860
font_01_sfnt_off000117d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D3 18520 bytes
SHA-256: a8af4ba5bccac1487ba66f32d1bf9d8de6b198008d1d7ae6daab6d0d50ff05a4
font_02_sfnt_off00014809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1